7939 has 4 divisors (see below), whose sum is σ = 8424. Its totient is φ = 7456.

The previous prime is 7937. The next prime is 7949. The reversal of 7939 is 9397.

7939 is an esthetic number in base 7, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7939 - 2¹ = 7937 is a prime.

It is a Duffinian number.

7939 is a lucky number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (7933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217 + ... + 250.

It is an arithmetic number, because the mean of its divisors is an integer number (2106).

7939 is a deficient number, since it is larger than the sum of its proper divisors (485).

7939 is a wasteful number, since it uses less digits than its factorization.

7939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484.

The product of its digits is 1701, while the sum is 28.

The square root of 7939 is about 89.1010662114. The cubic root of 7939 is about 19.9490369152.

It can be divided in two parts, 79 and 39, that multiplied together give a triangular number (3081 = T₇₈).

The spelling of 7939 in words is "seven thousand, nine hundred thirty-nine".